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ASIN(3)                    Linux Programmer's Manual                   ASIN(3)

NAME
       asin, asinf, asinl - arc sine function
SYNOPSIS
       #include <math.h>
       double asin(double x);
       float asinf(float x);
       long double asinl(long double x);
       Link with -lm.
   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
       asinf(), asinl():
           _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99
DESCRIPTION
       The asin() function calculates the principal value of the arc  sine  of
       x; that is the value whose sine is x.
RETURN VALUE
       On  success, these functions return the principal value of the arc sine
       of x in radians; the return value is in the range [-pi/2, pi/2].
       If x is a NaN, a NaN is returned.
       If x is +0 (-0), +0 (-0) is returned.
       If x is outside the range [-1, 1], a domain error occurs, and a NaN  is
       returned.
ERRORS
       See  math_error(7) for information on how to determine whether an error
       has occurred when calling these functions.
       The following errors can occur:
       Domain error: x is outside the range [-1, 1]
              errno is set  to  EDOM.   An  invalid  floating-point  exception
              (FE_INVALID) is raised.
CONFORMING TO
       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
       4.3BSD, C89.
SEE ALSO
       acos(3), atan(3), atan2(3), casin(3), cos(3), sin(3), tan(3)
COLOPHON
       This page is part of release 3.53 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

                                  2010-09-20                           ASIN(3)